Compressed-air automatic oil and water pump



A. AND W. 0TT0. COMPRESSED AIR AUTOMATIC OIL AND WATER PUMP.

Patented Nw. 9, 1920.

4 SHEETS-SHEET l.

. APPLICATION FILED JUNE 2,19l9. 1,358,288.

A. AND W. OTTO.

COMPRESSED AIR AUTOMATIC OIL AND WATER PUMP.

APPLICATION man luNE 2.1.9129.

1,358,238. Patented Nov. 9, 1920.

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A. AND W. OTTO. lCOMPRESSl-ID AIR AUTOMATIC 0H. AND WATER PUMP.v

, l APP A 193585238 Llc TloN man JuNEz 1919 Patented NOV! 9 1920.

4 SHEETS-SHEET 3.

[NVE TORS ATM/EY A. AND Wl OTTO.

COMPRESSED AIR AUTOMATIC OIL AND WATER PUMP.

APPLICATION FILED IUNEZ 1919.

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' all' COITIPLESSOT itl) NlTED STATES PATENT OFFECBW ALBERT OTTO AND' ELLIAMOTTG, OF KANS-AS CITY, MESSOURI, SIGN-ORS OF ONE- HALF T0 FRANCESE. SCOTT GLENN BUTLER, BOTH OF KANSAS CITY, MIS- SO URI.

Application filedy Tune 2,

' 'o all fw hom t may concern,

13e it known 'that we, ALBERT OTTO and Trimmer O'r'ro, citizens of the United States of America, residing at Kansas City, inthe county of laclrson and State of Missouri, lave invented certain new and 'useful lmprovemcnts in Compressed-ndr Automatic @il and "Water umps; and we do hereby declare that the following is a full, clear, and exact description of the invention, reference being had to the accompanying drawings, forming a part of this specification.

The invention has for its objects,

First. A pump for oil and water which self-operative to effect a displacement of.

the oil and water by the expansive force of compressed air or elastic iiuid,

Second. ein automatic pump operative by the expansion of the compressedair or elastic fluid high or low pressure.

Third. An automatic pump for oil wells which will keep the sand in the well, be constantly covered with the oil, and may be regulated in its pumping action to theheight of the oil within the pump.

Fourth. ln a compressed air pump, to

effect thepump action automatically at 4the various water levels within the pump and continuous action at shallow depths. Y

Fifth. ln a compressed air or gas pump to control by the expansion of the air or elastic fluid, the air pressure upon the oil or water within the pump.

Sixth. To eliminate the sand action upon.

the pump in oil wells. p

rihe invention consists in the novel construction and combination of parts such as will be firstfully described and then specifiY cally pointed out in the claims.

in the drawings, zigure l, is a vertical sectional view of an cil well and the casing, showing the novel pump within the oil sand, also showing the the surface of the ground and conmressed 1 air tank, and oil tank, a three-way pipe joint couplingconnecting ssd tanks, a compressed air pipe leading p ifroni to the pump, and the oil pipe extending tlnfough said pipe to the oil tank; also showing the inlet pipe for the comssed air to tne pump and the tube for the compression spring.

Figs. 2 and 2, are vertical sectional views Specification of Letters Eatent.

COMPRESSED-AIR AUTOMATO DIL .AND WATER PUMP.

atented Nov. 9, 1920.

isis. sei-mino. 301,139.

enlarged of the novel pump in two halves, showing the high pressure inlet valve pipe for the compressed air and the automatic air controlling devices, to the compressed air, the float being positioned at an intermediate point within the pump cylinder.

nlig. 3, is a detail vertical sectional view or the upper portion or head of the pump cylinder, taken on line 3--3 on Fig. 7, showing the conduit for the oil from the cylinder y and the compressed air pipe, the compressed tube on the cylinder head, and compression spring and plunger, the tripping wheel and dogs, the rack on the plunger held by the tripping wheel, and the lever controlling the air inlet valve actuated by the rack.

e-, is a side view of the upper end or head of the pump cylinder, as seen in Fig. l, taken from a position to left of the pump, showing the high pressure valve pipe and the exhaust pipe, also showing the tube on the pump head carrying the spring and `ilunger and the pipe connection therefrom for the excess of compressed air in the tube connected with the exhaust valve pipe.

Fig. 5, is a detail vertical sectional view of a port-ion ofthe cylinder head or cap plate and the portions of the inlet and exhaust pipes within the cylinder and the spring controlled valve stems, and valves for the compressed air, taken on the line 5-5 ou Fig. 8. f

`Fig. 6, is a detail view in perspective of the supporting block or hanger for the tripping cog wheel secured to the cylinder head showing the dogs and connecting spring the slidable braclet and inclined planes on the bracket and the rollers on the dogs upon the inclined planes, also showing a portion of one of the lever arms pivoted to and operat- Fig. 8, is a transverse sectional view taken through the well casing pump cylinder and air inlet and exhaust pipes, on line 8-8 on Fig. 2, loolnng upwardly.

Fig. 9, is a transverse sectional view taken through the pump cylinder and the hollowr vthe pump cylinder taken on the line 12e-12 on Fig. 2a, showing the iiap valve admitting the oil and water to the pumpcylinder.

Similar numerals of reference indicate corresponding parts in all the figures ofthe drawings.

Referring to the drawings, Y

l5 -ndicates thecylinder of the pump, which for-theorie purpose illustrated in its application to oil wells, is made of considerable length, and of the circumference requisite to be-introduced within the casing to said wells.

The upper end of the pump cylinder is internally screw-threaded at 16 and a cylinder head or cap 17 of the same circumference as the cylinder closes -hermetically by the gasket 17f the end of thev cylinder, this cap or head being provided with a downwardly extended externally screwthrea-ded flange 1S which is tted tothe screw-threaded portion 16 of said cylinder.V

The lower end portion of the cylinder 15, is also internally screw-threaded at 19,and within this screw-threaded opening is fitted an externally screw-threaded plug 20, having a central opening 2l. A flap valvel 22 extends over said opening, its lip 23 being securedv to the plug by the screws 24. This valve is providedY with a circular weighted disk 25, secured to the. valve-by thescrew 26.

27' indicates the discharge pipe for the oil Within the pump cylinder l5, the lower end of which pipe extends downwardly to a position a short distance above the-iiap valve 22V and is externally screw-threaded at 28, seeFig. 11.

29 indicates a valve casing having upper and lower end members 30 and 31 respectively, the upper. end member havinga screw-threaded opening 32'7 in which is fitted the externally screw-threaded lower endof the pipe 27. The lower end 3:1 of the valve casing is provided with an inlet opening32, having a valve seat 33in which is seated aball valve 34. lThe lower end 31 of the casing has. a Short flange 32 extending around the opening 32.

The lower endof pipe 27 within the cas,- ing 29 is notched atk 35 upwardly topermit the oil to escape up the pipe past the ball valve. i

The upper end ofthe pipe 27is. exter-V nally screw-threaded. at 27 and extends within the screw-threaded opening 36, in the center of the head or cap 17 to the pump cylinder, and a short distance above said head and within a, screw-threaded upward extensiony 37 of said cap plate, extending around said opening and within which opening is inserted the lower end of a short pipe 38.

'The upper end of pipe 38 is externally screw-threaded at 39 and above said pipe isla pipe 40 of the same circumference and externally screw-threaded at 41, the adjacent ends` of pipes 40 and 38 being connectedby-an internally screw-threaded pipe coupling- 42.

Onv the screw-threaded portion of the pipe4'0,4 abovethe pipe coupling, is a gasket'43.

44 indicates a` pipe coupling of a larger circumference than pipe couplingL 42, and having a screw-threaded opening in its lower half and fitted to the screw-threaded Y portion of,l pipe 40 and turned down on the gasket orwasherv 43. The upper half` of the coupling iS--made with an opening ccnsiderably larger in circumference than the pipe V40- and screw-threaded` at 45, the screw threads terminating at the shoulder- 45 which closes the opening, the pipes 3S and 40-being ar continuation upwardly of the oil pipe 27.

46 indicates the compressed air pipe larger in circumference than pipe 40, its lower end being externally screw-threaded and fitted within the screw-threaded upper half ofthe pipe coupling 44, the upper end of the said pipe extending upwardly to the surface of the ground, as further described. With the side. of the air pipe 46, immediately above`the coupling 44, is connected the upper curved endof. the air inlet pipe 47, the lower endV of which pipe extends downwardly part way within a screwthreadedopeningl-S in the head or cap 17 to the pump cylinder, at a point immediately forwardofavline extending diametrically to the oil tube 27, as seen in Figs. 5 and 7.

Surrounding the oil pipe 27, within the pump cylinder, is a4 vertically slidable thin pipe 50, see Fig. 3, approximately as shown half the length of the oil pipe 27 and slightly larger in.V circumference than said pipe. Upontheupper end ofthe pipe is rigidly connected aflange or collar 51, andupon the lower endrof said-'pipe-isan adjustable collar 52 having an adjusting screw 52X. i

Uponthe oil pipe27, beneath the lower endaofpipe 50, is mounted a collar 53 and fixedly secured thereto.

UponpipeO, is slidingly mounted a hollow cylindrical air tightidrum 55, which performs the; office of a float, see Fig. 9. Through the center of the float extends a tube 56, hermetically sealed within'the openings to said drum, its upper end extending upwardly at 56 a short distance above the upper end of said drum and its lower end a short distance below the lower end of said drum at 56X, see Figs. 2-2. A valve 55 on the drum admits air to the drum to equalize the pressure on the outside. Upon the lower end of the oil pipe 27, immediately abovethe casing 29, for the ball valve, is a circular spoked wheel 57 slightly smaller in circumference than the inner circumference of the pump cylinder and having a hub 58 mounted on the oil pipe 27, see Fig. l0.

The hub 58 is provided with a set screw 59 securing the wheel to the oil pipe; The wheel serves to keep the oil pipe from lateral movement in the pump cylinder, the oilpassing upwardly through the openings 58O between the spokes, see Fig. l0.

lVithin the pump cylinder and supported by the head or cap 17, are the separate tubular inlet valve casing 60, and the tubular exhaust valve casing 61, arranged a short distance apart, see Fig. 5. The upper end of valve casing 60 is externally screwthreaded and is fitted within the lower screw-threaded portion of the opening 48 receiving the lower end of the air inlet pipe i7, the opening 60 in the upper end of the valve casing 60 being of the same size as the opening in the inlet pipe 47, both being in communication. The valve opening 60` ex tends downwardly a short distance to a valve seat 6()O and beneath said valve seat the opening 60 in the valve casing 60 is reduced slightly in circumference.

62 indicates the valve stem within the casing 60, a portion concentric with the upper end of said stem being out away below the head of the stem and inclined inwardly' at 6l beneath said head to enter the valve seat 6()O in the valve casing 60. Beneath the valve seat 600 a short distance in the valve casing, is a transverse inlet opening 63 for the compressed air to the pump cylinder.

The lower end of the valve stem 62 extends a short distance below the line of the lower end of the valve casing 60 'and upon said end is loosely mounted a perforated blocl 64, and upon said stem, above ythe block, is a fixed collar 65. On the lower end of the stem is a fixed collar 66, and extending around said stem is a spiral spring 67, one end bearing on said collar 66, and the other end on the lower end ofv block 64:.

In the cap plate or head 17 of the pump cylinder immediately in rear of the opening a8, in said plate, for the compressed air pipe 47, see Fig. 7), is a screw-threadedopening 67, in which is tted the screw-threaded upper end of the aforesaid exhaust valve casing 6l, the said end terminating a short distance above the cap plate 17 of the pump cylinder. The longitudinal opening 69 in the upper end of the valve casing 61, is 1re duced in circumference a short distance bclow the'upper end of the casing to form a neck 70, and on the lower portion of said neck a valve seat 7l. '7 2 indicates the valve stem within the valve casing which is provided with a beveled head '73 adapted to lit the valve seat 7l. y

In the valve casing, a short distance below the valve seat, is a transverse opening or port 7 a, which is closed by the valve stem 72, following the admission of compressed air to the pump cylinder through the inlet opening 63.

The lower end of the valve stein 72 extends a short distance below the lower end of the valve casing 6l, and uponsaid end is loosely mounted a block '75 having an opening for the stem therethrough, and on said `stem above the block a spiral spring 76, one end bearing on the upper end of said block, and the other end on a collar 76 fixed to said stem a short distance upwardly. @n the lower end of said valve stem, is fixed collar 77, retaining said block on the stem.

A connecting pin 78, screw-threaded at both ends, extends at one end within a screw-threaded opening in the block 6l, and at the other end within a screwthreaded opening in block 75. 79 indicates a supporting rod or bar iixedly connected at its upper end to the inner surface `of the cap plate or head -17 of the pump cylinder, the lower end of said bar extending downwardly to a position immediately in rear of the pin '78.

8O indicates a lever consisting of a hori- Zontal fiat bar, the short end being forked, to receive the pin 78, the lever or bar being pivoted at 8O to the said lower end of the bar 79. The long arm of said lever is bentV in a curved line and extended forwardly a short distance around the oil tube 27, and thence a short distance past said tube and at a tangent thereto, see Fig. 8.

ln the cylinder head or cap plate 17, a short distance forward and to the right of the opening 36 for the oil pipe 27, is a screwthreaded opening 8l. See Figs. 3 and 7.

82 indicates a block or bracket within the pump cylinder nearly rectangularin form and having an externally screw-threaded nipple 83 rigidly connected with the upper end of said bracket adjacent its outer surface toward the pump cylinder. This nip ple is fitted to said screw-threaded opening 8l in the cap plate 17, and extends part way therein. `Extending downwardly from the nipple throuo'h the bracket is a vertical opening 8l. lxtending inwardly from the lower portion of the bracket from the verti cal opening 84, and through the inner longitudinal surface of said bracket, is a narrow recess85.

86 indicates an arm pivotedat its lower end to the collar 5l, on the upper end of the sliding pipe 50, see Fig. 2. With the Yupper end of the arm 86, is pivotally connected at 87X one end lof an arm 87, the other end of which arm extends upwardly at an angle to:

the arm 86 to a position upon the forward side of the bracket 82, a short distance up wardly from the lower end of said bracket.

Through the latter end of. arm87 extends apivot bolt 88, having a tap to hold the arm 87 loosely against the bracket, which also extends through the bracket and recess 85.. lVithin this recess 85 and mounted on` the pivot bolt 88, is a cogwheel 89.

90 indicates the upper dog which is pivoted at its inner end at 90X to the bracket4 82 in the upper portion of recess 85 and extends outwardly and downwardly and engages between the cogs ofAA wheel 89.

91 is the lower dog which is pivoted in the lower portion ot' the recess 85, on the pivot 91 extending through said braeketthe dog extending` upwardly and engaging' atk the Vproper time between the cogs of wheelr89.

A Each of the dogsY 90 and 91, is constructed with a lateral projection on its free end, the tace of which remote from the pivot of the dog is in a plane at right angles tothe longitudinal axis of the dog, while the face toward the pivot is inclined to said axis, so that theV dog constitutes a pawl, preventing rotation of the cog wheel'toward the pivot but permitting its rotation rroin'the pivot.

Through the forward ends ot'dogs 90 and 91, extend transversely the pins or pivotsv the block 95 is notched from its upper-end downwardly and thence inclined outwardly and downwardly, to forni a bearing surface 96, andthe lower end of said block is notchedin a similar manner, and the bearing surface 97 inclined outwardly and `upwardly. 0n the pin 92 on the dog 90, which extends from said dog toward the sliding block 95, is a. roller 98, .which bears on the inclined surface 96 of said block, and onthe pin 98 on the dog 91 isa roller 99 which bears on the inclined `surface 97 of the block 95. In the arm 87, which extends past'the block 95, is an opening 100, andin the block 95 is a pin 101 extending outwardly through said opening 100. The automatic valve operating device consists of a tube 102 `having an external screw-thread at its lower end which is fitted to the upper half of the screw-threaded opening 81 in the cap` plate or head 17 of the pump cylinder. This tube extends a considerable distance upwardly from the upper surface of said plate 17 and vits upper end is internally screwfthreaded.

nsaid end, is fitted a screw-threaded'plug 108, secured from movement by a screw 104:.

A. small airtube 105 is secured to the outer and its lower end extending downwardly a distancel approximately one-halt the distance from the upper to the lower end of said tube and bears against the slidable plunger 107 inwhichy isa screw-threaded opening 108, in which opening is fitted` the upper screwthreaded end et a rod 109.

110 and 111 are vcup-shaped leather washers on the rod 109, immediately below the plunger107, and which bear 'rictionally on the inner surface of* the tube 102.

The lower end of the rod 109 extends downwardly through the opening 84 in the bracket 82 and to a position a short distance below the lower end of bracket 82 and loosely within said opening in the bracket and is notched at` intervals to form a `rack 112 which rack moves in engagement with `the cog-teeth of the wheel 89. The air is thus permitted to pass thel'rackl and enter the tube 102 and actuate the'plunger.

rllhe extreme lower end of' the rack 112 is screwthreaded andupon said end is iitted a screw-threaded collar `113, and beneath said collar is a lock nut 11al having a screwthreaded opening iitted. to said end of the' rack, whichnut. isin contact with the orward side and outer end` of the lever 89 operating the valve stems 62 and 72. rllhrough-;said nut 11e-and the screw-threaded end otl the' rack 112, extends a pivot 115, whichA pivot extends throughthe outer end of' the lever 80.

116 represents an oil well and 116 the casing, which extends downwardly to the ordinary depth or to the oil sand. At the surface ot the ground, 117 indicates an air compressor and 118 a storage tank for coin- -pressed air, from which leads a pipe 119 to a three-way pipe joint 120. 121'indicates a storage tank for the oil, and 122 a pipe leading from` the vthree-way joint to the oil tank.l l

The upper end of the compressedair pipe leadingl from the pump is connected with the three-way pipe joint 120, and the oil pipe 27 extends upwardly within pipe 46,' and the pipe joint 120, and is connectedwith the pipe 122 leading to the oil tank. A valve 119X is shown in pipe 119. The pumpA cylinder 1'5, with itsair conducting pipe 48, is lowered to the bottom ot the well and within the oil'sand which has been removed in the drilling operations. In operation the oil entering the opening 21 inthe plug 20 at the lower end 4of the pump cylinder raises the flap valve 22 and ,rises in said cylinder. lVhen the inlet and exhaust valve stems 62 and 72, and the respective valve heads in the respective valve casing 60 and 61, are in the position seen in Fig. 5, the inlet valve head ont' the stem 62 is on the valve seat 60X and closed, while the valve stem 72 is in an open 1oosition as respects the exhaust openings O and 74 and` held down by the lever 80, the cog wheel 89 being locked against rotation under the influence of spring 106 by the engagement of the abrupt face of the upper dog with the cogs on the cog wheel. Compressed air from the storage tank 118 is then admitted to the pipe 46, which passes into the inlet pipe L17 to the valve head on the valve stem 62.

The float or drum 55 in the pump cylinder is shown at an intermediate position on the slidable pipe 50. As the oil rises in the f pump cylinder 15, its pressure forces upwardly said 'float or drum `55 from its position on the said pipe 50 until said float comes into contact with the collargl on the upper end of said pipe and raises the pipe and, through the.` pivoted `bars86 4and 87 raises the block 95, which moves aslight distancev outwardly from the bracket 82, and the up per inclined'bearing surface on said block acts on the roller 96 to raise the dog 90 from between the cogs on the cog wheel 89. At the same time, the lower dog is disengaged from the block 95 and is brought by the spring 9i into engagement with the cog wheel 89, its abrupt :tace preventing the rotation of the cog wheel anti-clockwise. The spring 106 then depresses piston 107 and rack 112, which rotates cog wheel 89 clockwise, the lower dog slipping over the cogs ou said wheel, permitting the rack to Vmove the long arm of lever 80 downward, thereby opening the inlet valve on stem 62 and closing the exhaust ports and 74. Thus compressed air is admittedto the cylinder 15, driving oil therefrom through pipe 27, and the tendency i of ythe pressure on the lower side of piston 107 toshiftthe values to their former positions cannot` become effective until the lower `dog is disengaged jfrom the cog wheel.

While the compressed air is exerting its pressure within the pump cylinder upon the oil, `it also entersthe opening 84 in the bracket 82 for the `rack 112, and enters the tube 102 in the cylinder head 17 exerting a pressure on the cup-shaped washerss110-111 in said tube. When'the lower dog isldisengaged from the cog wheel, the compressed air forces the plunger 107 upwardly within the tube, thereby compressing 'the spring 105 and aise drawing upwardly the .rae

bar 112 in the opening 841 in. the bracket, and drawing up the long arm of the lever 80 pivoted to said bar, thereby closing the inlet valve on steam 62 on itsseat and opening the exhaust ports 70 and 7 4, relieving the pressure of the air on the oil in the pum cylinder.

When the float has moved downwardly to the adjustable collar 52 on the tube 50, the tube 50 is drawn downwardly, which draws down on the arms 86 and 87, and the lower inclined bearing 97` on the slidable block moves the lower dogl 91 out of engagement with the cog wheel 89 and the compressed air within the cylinder and tube forces the rack 112 upwardly, compressing the spring 106 in the tube 102, and the upper dog 90 falls down with the spring tension between the cogs of wheel 89, holding said wheel as an escapement from rotation clockwise until the float rises again in the pump cylinder and releases the dog, when the operation oi the devices as described,-is repeated.

By making the tube 50 of increased length,

`the ioat 55 will move farther in its downward movement, thereby pumping a larger quantity of oil from the pump cylinder, or

by adjusting the collar 52 upwardly on pipe 50 the movement of the float may be lessened and the quantity of wateror oil supply thus regulated. l1n our invention the float is not held down by extraneous means or submerged in the incoming liquid, but is free to rise and fall at the various fluid levels, hence nonsubmerged and its action effective at high and low levels in its reciprocal movements.

The pump is adapted to be used for pumping water from cisterns or, ordinary wells, and distributed from a storage tank similar to the tank 118 under pressure or pumped directly to the consumer without using the storage tank.

Such modifications of the invention may `be employed as are within the scope of the appended claims.

Having fully described our invention,

,what we now claim as new and desire to obtain by Letters Patent is, Y

V1. In a compressed air pump, the combination with the pump cylinder having a head, an internal liquid eduction pipe, air inlet and exhaust valves controlling alternately the inlet and exhaust of the com-' pressed air, a source of supply of compressed air leading to the cylinder, an automatic device controlled by the pressure of compressed air actuating theopening and vclosing of the valves, and-locking means governing the action of said device, an inde-` pendently movable float, and devices actuated reciprocally by the float in the rise and `fall of the liquid within the cylinder governin the action of 'the said locking means.

2., ln a compressed air pump, the tambi and connected with the valve operating lever, a cog` Wheel on the bracket engaging with said rack, dogs on said bracket, adapted to engage alternately with said cog Wheel, a slidable dogI releasing device on the bracket and means for operating the dog releasing devices.

1l. a compressed air pump, the combination with the cylinder and cylinder head, and with air inlet and exhaust valves, and .vith a pivoted valve operating lever, of a tube on the cylinder head extending Within said head and having a closed outer end, a bracket on the said head within the pump cylinder having an opening in communication with the opening in said tube, a compression and expansion spring Within said tube, a plunger and a combined plunger rod and rack acting against said spring and connected with the valve operating pivoted lever, a cog Wheel onthe bracket engaging with said rack dogs pivoted on said bracket, and adapted to engage alternately with said cog Wheel, a coiled spring connecting one dog with the other, rollers pivoted to said dogs, and a vertically movable block on said bracket having oppositely inclined roller bearing surfaces for said rollers, and means for im aartino an oaerative movement to said block. p

12. In a compressed air pump, the combi nation With the pump cylinder andl cylinder` head, and with an internal liquid discharge pipe extending through said head, and with a source oicompressed air and a compressed pipe larger in circumference and co-axial with the liquid discharge pipe extending in the direction oit the cylinder head and having a closed lower end, inlet and exhaust tubular valve casings Within the cylinder extending through said head, said inlet tubular valve casing extending upwardly and connected with the compressed air pipe, said inlet and exhaust tubular valve casings having valve seats and ports and valve stems and valves on said stems Within the valve casings, a connecting device connecting one valve stem with the other, a pivoted valve operating lever connected With said device, a float Within the" cylinder and devices actua-ted by the rise and fall of the liquid, adapted to impart motion to the pivoted valve operating lever.

13. ln a compressed air pump, the combination with the cylinder and cylinder head, and With a liquid discharge pipe extending through said head, of a slidable pipe coaxial with the liquid discharge pipe having a collar at its upper end, a floating drum, a tube hermetically connected with the drum, and through which said slida-ble pipe extends, an adjustable collar on said slidable pipe beneath said drum, a bracket Within the cylinder connected with the cylinder head having a recess and a vertical opening extending past said recess. a con' Wheel piv oted to said bracket Within said recess, a tube on the cylinder head communicating with the cylinder' and having a closed outer end, a compression and expansion spring in said tube, a plunger, and a combined plun'- ger rod and rack extending through the opening in said bracket and engaging with the cog Wheel, suitable air inlet and exhaust valves to said .cylinder and a pivoted lever connected With said combined plunger rod and rack dogs on said bracket and a spring Y connecting said dogs, a vertically movable block on said bracket having inclined surfaces at each end, rollers on said dogs bearing on said inclined surfaces, and arms piv- 4oted on the collar on the upper end of said slidable pipe'on the liquid discharge'pipe,

one of said arms being pivotally connected with said bracket and also 'pivot-ally con nected with the sliding block on said bracket.

ALBERT OTTO. WILLIAM OTTO Witnesses: Y Y

MARGUERITE BROWDER, MINNIE G. LONG. 

